Objective: The purpose of this study was to examine neuropsychological outcome within the first 12 months following mild traumatic brain injury (mTBI) in service members with and without concurrent post-traumatic stress disorder (PTSD). Method: Participants were 68 service members (92.5% male) who sustained an mTBI, evaluated within 6-months (M = 4.1 [SD = 1.9]; n = 50; i.e., Sub-acute Cohort) and/or at 1-year post-injury (M = 11.9 [SD = 1.1]; n = 43; i.e., Year 1 Cohort). Participants completed a neuropsychological test battery that included 30 common neurocognitive measures, the TBI-Quality of Life (TBI-QOL) scale, Minnesota Multiphasic Personality Inventory (MMPI-2-RF), and PTSD-checklist (PCL-C). Using the PCL-C, participants were classified into PTSD Present/Absent groups based on DSM-IV-TR criteria (Sub-acute Cohort = PTSD-Present [n = 18], PTSD-Absent [n = 32]; Year 1 Cohort = PTSD-Present [n = 13], PTSD-Absent [n = 30]). Participants were excluded for poor effort and symptom exaggeration. Results:...

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